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Catalyst for synthesizing 2-chloro-3,3,3-trifluoropropene from 1,1,2,3-tetrachloropropylene and preparation method thereof

A technology of tetrachloropropene and trifluoropropene, which is applied in the field of catalyst and its preparation, and can solve problems such as low selectivity, low stability, and complicated treatment

Active Publication Date: 2012-08-01
ZHEJIANG SANMEI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the technical defects such as low selectivity, complicated treatment and low stability of existing gas-phase fluorination catalysts, the purpose of the present invention is to provide a catalyst with high activity, high selectivity, high specific surface area, simple process, convenient production and The templating agent raw material that adopts is cheap by 1,1,2, the catalyzer and preparation method thereof of 2-chloro-3,3,3-trifluoropropene synthesis by 1,1,2,3-tetrachloropropene, adopt this preparation method to be able to improve particularly by 1 , Selectivity and stability of catalysts for the fluorination of 1,2,3-tetrachloropropene to 2-chloro-3,3,3-trifluoropropene

Method used

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  • Catalyst for synthesizing 2-chloro-3,3,3-trifluoropropene from 1,1,2,3-tetrachloropropylene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] According to the Cr, Al and Zn molar ratio 1:0.1:0.05, weigh CrCl 3 ·6H 2 O, AlCl 3 and ZnCl 2 . CrCl 3 ·6H 2 O, AlCl 3 and ZnCl 2 After mixing, dissolve in water, add KOH alkali solution dropwise under stirring conditions until the precipitation is complete, and then filter to obtain Cr(OH) 3 , Al(OH) 3 and Zn(OH) 2 mixture. Add the sucrose-citric acid solution with a molar ratio of 1:1 to the mixed precipitate, mix well, and dry it under N 2Calcined at 450°C for 4 hours under the atmosphere to obtain oxides containing carbon templates. The oxide containing the carbon template was HF-N with a molar ratio of 1:4 2 The mixed gas was treated at 300°C for 12 hours, and then oxidized under an oxygen atmosphere for 10 hours to remove the carbon template to obtain CrF 3 , AlF 3 and MF 2 Composition of the catalyst of the present invention.

[0026] The catalyst prepared in Example 1 is applied to gas-phase fluorination of 1,1,2,3-tetrachloropropene to synthesi...

example 2

[0028] Weigh Cr(NO 3 ) 3 9H 2 O, Al(NO 3 ) 3 and Zn(NO 3 ) 2 ·6H 2 O. Cr(NO 3 ) 3 9H 2 O, Al(NO 3 ) 3 and Zn(NO 3 ) 2 ·6H 2 After O is mixed, it is dissolved in water, and KOH alkali solution is added dropwise under stirring conditions until the precipitation is complete, and then filtered to obtain Cr(OH) 3 , Al(OH) 3 and Zn(OH) 2 mixture. Add sucrose-citric acid solution with a molar ratio of 1:1 to the mixture, mix well, and dry it under N 2 Calcined at 450°C for 4 hours under the atmosphere to obtain oxides containing carbon templates. The oxide containing the carbon template was HF-N with a molar ratio of 1:4 2 The mixed gas was treated at 300°C for 10 hours, and then oxidized under an oxygen atmosphere for 10 hours to remove the carbon template to obtain CrF 3 , AlF 3 and MF 2 Composition of the catalyst of the present invention.

[0029] The catalyst prepared in Example 2 is applied to the fluorination of 1,1,2,3-tetrachloropropene to synthesize ...

example 3

[0031] Weigh Cr(NO 3 ) 3 9H 2 O, Al 2 (SO 4 ) 3 and Zn(NO 3 ) 2 ·6H 2 O. Cr(NO 3 ) 3 9H 2 O, Al 2 (SO 4 ) 3 and Zn(NO 3 ) 2 ·6H 2 After O is mixed, it is dissolved in water, and KOH alkali solution is added dropwise under stirring conditions until the precipitation is complete, and then filtered to obtain Cr(OH) 3 , Al(OH) 3 and Zn(OH) 2 mixture. Add sucrose-citric acid solution with a molar ratio of 1:1 to the mixture, mix well, and dry it under N 2 Calcined at 450°C for 4 hours under the atmosphere to obtain oxides containing carbon templates. The oxide containing the carbon template was HF-N with a molar ratio of 1:4 2 The mixed gas was treated at 300°C for 12 hours, and then oxidized under an oxygen atmosphere for 14 hours to remove the carbon template to obtain CrF 3 , AlF 3 and MF 2 Composition catalyst of the present invention.

[0032] The catalyst prepared in Example 3 is applied to the fluorination of 1,1,2,3-tetrachloropropene to synthesize...

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Abstract

The invention relates to a catalyst for synthesizing 2-chloro-3,3,3-trifluoropropene from 1,1,2,3-tetrachloropropylene and a preparation method thereof. The catalyst is composed of Cr, Al and M fluoride, wherein M is one or both of Zn and Co; the Cr-Al-M mol ratio is 1:(0.05-0.2):(0.02-0.1). The preparation method comprises the following steps: adding a KOH alkaline solution into proportional Cr compound, Al compound and M compound to form a precipitate, or directly mechanically blending the three compounds to form a mixture; adding a sucrose-citric acid solution (the sucrose-citric acid mol ratio is 1:1) into the mixture, thoroughly mixing, drying, and roasting in an N2 atmosphere to obtain an oxide containing a carbon template; and treating the oxide precursor containing carbon template with inert gas and anhydrous hydrogen fluoride, and oxidizing in an oxygen atmosphere to remove the template, thereby obtaining the catalyst. The catalyst provided by the invention has the advantages of simple technique, high activity, high selectivity, high stability and the like, and is convenient to produce.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for synthesizing 2-chloro-3,3,3-trifluoropropene from 1,1,2,3-tetrachloropropene and a preparation method of the catalyst. technical background [0002] Currently, 1,1,1,2-tetrafluoroethane (HFC-134a, CF 3 CFH 2 ) has been widely used in automobile air-conditioning and refrigeration, and was once considered to be one of the more ideal ODS substitutes. However, because the GWP value of HFC-134a is as high as 1300, and it is easy to form trifluoroacetic acid, which is seriously harmful to the ecosystem after dissociation in the atmosphere, governments of various countries have begun to phase out HFC-134a. Therefore, the performance of all aspects of development is close to or even exceeds that of HFC. New refrigerants with -134a and lower GWP value are imperative. Among them, 2,3,3,3-tetrafluoropropene (HFC-1234yf, CF 3 CF=CH 2 ) is listed as one of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138B01J27/132C07C21/18C07C17/20
Inventor 卢新国占林喜何晓玲
Owner ZHEJIANG SANMEI CHEM IND
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